from django.db import models

from haystack import indexes, signals

from core.models import User


class UserIndex(indexes.SearchIndex, indexes.Indexable):
    text = indexes.CharField(document=True, use_template=True)

    def get_model(self):
        return User

    def index_queryset(self, using=None):
        """Used when the entire index for model is updated."""
        return self.get_model().objects.all()

    def get_updated_field(self):
        return "last_update"


class UserOnlySignalProcessor(signals.BaseSignalProcessor):
    def setup(self):
        # Listen only to the ``User`` model.
        models.signals.post_save.connect(self.handle_save, sender=User)
        models.signals.post_delete.connect(self.handle_delete, sender=User)

    def teardown(self):
        # Disconnect only for the ``User`` model.
        models.signals.post_save.disconnect(self.handle_save, sender=User)
        models.signals.post_delete.disconnect(self.handle_delete, sender=User)